capital

I UK [ˈkæpɪt(ə)l] / US noun
Word forms "capital":
singular capital plural capitals
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1)

a) capital or capital city

[countable] the city where a country or region has its government

Madrid is the capital of Spain.

state/regional/provincial capital:

Tallahassee is the state capital of Florida.

b) the most important place for an activity or industry

Milan, Italy's fashion capital

capital of:

Officials will fly to Houston, capital of the American oil industry.

2) capital or capital letter

[countable] the large form of a letter, for example "A" or "B", that you use at the beginning of a sentence or name in capitals:

He wrote the title in capitals.

3) [uncountable] business money or property that you use to start a business or invest to earn more money

4) [countable] in architecture, the decorated top part of a column (= tall stone post that supports a building)

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- make capital out of something

II UK [ˈkæpɪt(ə)l] / US adjective **

1) [only before noun] a capital letter is the large form of a letter, for example "A" or "B", that you use at the beginning of a sentence or name

2) British informal old-fashioned excellent

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with a capital A/B/C etc — used for emphasizing that something is very true

This is a case of incompetence with a capital I.